Getting a Base64 codified PDF from WebService

I'm doing a developmnet that needs to download a base64 PDF codified from a webService. I call correctly to the WS, and its answer is this one. As you can see. in the node "v1:strEtiquetas" I get the label codified in Base64:

My idea is to save that value in a blob field (sticker) of one of my tables:

For testing that I'm getting all the data correctly, my nex step is to save the PDF in my computer:

But as you will know, this is saveing the PDF into a temp folder, that dissapears when the NAV session is closed. Does exist any way to download it to a folder indicated by me? Or may be, without saving the PDF phisically, to print it directly using the saved blob?